Help.SQLServerDAL/SQLHelper.cs

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//===============================================================================
// This file is based on the Microsoft Data Access Application Block for .NET
// For more information please go to 
// http://msdn.microsoft.com/library/en-us/dnbda/html/daab-rm.asp
//===============================================================================
//该源码下载自www.51aspx.com(５１ａｓｐｘ．ｃｏｍ)

using System;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Collections;
using System.Text.RegularExpressions;
using Help.Common;

namespace Help.SQLServerDAL
{

    /// <summary>
    /// The SqlHelper class is intended to encapsulate high performance, 
    /// scalable best practices for common uses of SqlClient.
    /// </summary>
    public abstract class SqlHelper
    {
        //数据库连接字符串
        public static readonly string ConnectionString = ConfigurationManager.AppSettings["Help"];
        // Hashtable to store cached parameters
        private static Hashtable parmCache = Hashtable.Synchronized(new Hashtable());
        /// <summary>
        /// Execute a SqlCommand (that returns no resultset) against the database specified in the connection string 
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  int result = ExecuteNonQuery( CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or T-SQL command</param>
        /// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
        /// <returns>an int representing the number of rows affected by the command</returns>
        public static int ExecuteNonQuery(CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {
            return ExecuteNonQuery(ConnectionString, cmdType, cmdText, commandParameters);
        }

        /// <summary>
        /// Execute a SqlCommand (that returns no resultset) against the database specified in the connection string 
        /// using the provided parameters.
        /// </summary>
        /// <remarks>
        /// e.g.:  
        ///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
        /// </remarks>
        /// <param name="connectionString">a valid connection string for a SqlConnection</param>
        /// <param name="commandType">the CommandType (stored procedure, text, etc.)</param>
        /// <param name="commandText">the stored procedure name or T-SQL command</param>
        /// <param name="commandParameters">an array of SqlParamters used to execute the command</param>
        /// <returns>an int representing the number of rows affected by the command</returns> 
        public static int ExecuteNonQuery(string connectionString, CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)
        {